I have frd 085u1.
if i use java 1.6u27x64 then current speed is 1 Mbit
if i use java 1.6u27x32 then current speed is 0.5 Mbit
if i use java 1.6u26x32 then current speed is again 1 Mbit
althouth internet have 4 Mbit. in same time other apps is working on 4 Mbit.

I am pretty sure that the download speed is not related to JDK in any way.

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I set proxy, but frd dont want work.
by that i use app for redirect connects to proxy/
with that app speed is 1 mbit

Make a simple test:
1. Install your own Apache server
2. Place some huge file on it
3. Enable direct download support link in FRD
4. Download that huge file

You will get a speed of your HD read/write limit.

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In frd I set proxy and socks5. The speed down by 20%.

Obviously the proxy you're using is slower than your internet connection.